We are thinking about getting a new SAN and the company is asking us for IOPS. I was hoping that VEEAM ONE would be able to give me that info for specific VM's based on a weeks logs?Is it possible to generate such a report?

Yes, you can create a report with custom performance metrics for all or just group of VMs. In order to do that please navigate to Workspace -> New report -> Templates -> Custom reports -> VMware Raw Performance Data or VMware Custom Performance.